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EXPLAIN generic_plan NOT supported in Citus (#7825) 

We thought we provided support for this in

b8c493f2c4

However the use of parameters in SQL is not supported in Citus. Since
generic plan queries use parameters, we can't support for now.

Relevant PG16 commit https://github.com/postgres/postgres/commit/3c05284

Fixes #7813 with proper error message
pull/7828/head^2
Naisila Puka 2025-01-02 01:00:40 +03:00 committed by GitHub
parent ab7c13beb5
commit 0a6adf4ccc
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
3 changed files with 13 additions and 31 deletions
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14
src/backend/distributed/planner/multi_explain.c
View File

@ -190,6 +190,14 @@ PG_FUNCTION_INFO_V1(worker_save_query_explain_analyze);
void
CitusExplainScan(CustomScanState *node, List *ancestors, struct ExplainState *es)
{
#if PG_VERSION_NUM >= PG_VERSION_16
if (es->generic)
{
ereport(ERROR, (errmsg(
"EXPLAIN GENERIC_PLAN is currently not supported for Citus tables")));
}
#endif
CitusScanState *scanState = (CitusScanState *) node;
DistributedPlan *distributedPlan = scanState->distributedPlan;
EState *executorState = ScanStateGetExecutorState(scanState);
@ -992,18 +1000,12 @@ BuildRemoteExplainQuery(char *queryString, ExplainState *es)
appendStringInfo(explainQuery,
"EXPLAIN (ANALYZE %s, VERBOSE %s, "
"COSTS %s, BUFFERS %s, WAL %s, "
#if PG_VERSION_NUM >= PG_VERSION_16
"GENERIC_PLAN %s, "
#endif
"TIMING %s, SUMMARY %s, FORMAT %s) %s",
es->analyze ? "TRUE" : "FALSE",
es->verbose ? "TRUE" : "FALSE",
es->costs ? "TRUE" : "FALSE",
es->buffers ? "TRUE" : "FALSE",
es->wal ? "TRUE" : "FALSE",
#if PG_VERSION_NUM >= PG_VERSION_16
es->generic ? "TRUE" : "FALSE",
#endif
es->timing ? "TRUE" : "FALSE",
es->summary ? "TRUE" : "FALSE",
formatStr,

26
src/test/regress/expected/pg16.out
View File

@ -81,29 +81,9 @@ SELECT create_distributed_table('tenk1', 'unique1');
(1 row)
SET citus.log_remote_commands TO on;
EXPLAIN (GENERIC_PLAN) SELECT unique1 FROM tenk1 WHERE thousand = 1000;
NOTICE: issuing BEGIN TRANSACTION ISOLATION LEVEL READ COMMITTED;SELECT assign_distributed_transaction_id(xx, xx, 'xxxxxxx');
DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
NOTICE: issuing SAVEPOINT citus_explain_savepoint
DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
NOTICE: issuing EXPLAIN (ANALYZE FALSE, VERBOSE FALSE, COSTS TRUE, BUFFERS FALSE, WAL FALSE, GENERIC_PLAN TRUE, TIMING FALSE, SUMMARY FALSE, FORMAT TEXT) SELECT unique1 FROM pg16.tenk1_950001 tenk1 WHERE (thousand OPERATOR(pg_catalog.=) 1000)
DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
NOTICE: issuing ROLLBACK TO SAVEPOINT citus_explain_savepoint
DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
NOTICE: issuing COMMIT
DETAIL: on server postgres@localhost:xxxxx connectionId: xxxxxxx
QUERY PLAN
---------------------------------------------------------------------
Custom Scan (Citus Adaptive) (cost=0.00..0.00 rows=0 width=0)
Task Count: 1
Tasks Shown: All
-> Task
Node: host=localhost port=xxxxx dbname=regression
-> Seq Scan on tenk1_950001 tenk1 (cost=0.00..35.50 rows=10 width=4)
Filter: (thousand = 1000)
(7 rows)
EXPLAIN (GENERIC_PLAN, ANALYZE) SELECT unique1 FROM tenk1 WHERE thousand = 1000;
EXPLAIN (GENERIC_PLAN) SELECT unique1 FROM tenk1 WHERE thousand = $1;
ERROR: EXPLAIN GENERIC_PLAN is currently not supported for Citus tables
EXPLAIN (GENERIC_PLAN, ANALYZE) SELECT unique1 FROM tenk1 WHERE thousand = $1;
ERROR: EXPLAIN options ANALYZE and GENERIC_PLAN cannot be used together
SET citus.log_remote_commands TO off;
-- Proper error when creating statistics without a name on a Citus table

4
src/test/regress/sql/pg16.sql
View File

@ -58,8 +58,8 @@ CREATE TABLE tenk1 (
SELECT create_distributed_table('tenk1', 'unique1');
SET citus.log_remote_commands TO on;
EXPLAIN (GENERIC_PLAN) SELECT unique1 FROM tenk1 WHERE thousand = 1000;
EXPLAIN (GENERIC_PLAN, ANALYZE) SELECT unique1 FROM tenk1 WHERE thousand = 1000;
EXPLAIN (GENERIC_PLAN) SELECT unique1 FROM tenk1 WHERE thousand = $1;
EXPLAIN (GENERIC_PLAN, ANALYZE) SELECT unique1 FROM tenk1 WHERE thousand = $1;
SET citus.log_remote_commands TO off;
-- Proper error when creating statistics without a name on a Citus table